mirror of
https://github.com/tmate-io/tmate.git
synced 2024-12-17 20:30:39 +01:00
248fb14f08
(instead of two in tmux.c and client.c).
497 lines
12 KiB
C
497 lines
12 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <event.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "tmux.h"
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struct imsgbuf client_ibuf;
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struct event client_event;
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const char *client_exitmsg;
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int client_exitval;
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int client_attached;
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int client_connect(char *, int);
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void client_send_identify(int);
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void client_send_environ(void);
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void client_write_server(enum msgtype, void *, size_t);
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void client_update_event(void);
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void client_signal(int, short, void *);
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void client_callback(int, short, void *);
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int client_dispatch_attached(void);
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int client_dispatch_wait(void *);
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/* Connect client to server. */
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int
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client_connect(char *path, int start_server)
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{
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struct sockaddr_un sa;
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size_t size;
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int fd, mode;
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memset(&sa, 0, sizeof sa);
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sa.sun_family = AF_UNIX;
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size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
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if (size >= sizeof sa.sun_path) {
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errno = ENAMETOOLONG;
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return (-1);
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}
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if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
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fatal("socket failed");
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if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
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if (!start_server)
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goto failed;
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switch (errno) {
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case ECONNREFUSED:
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if (unlink(path) != 0)
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goto failed;
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/* FALLTHROUGH */
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case ENOENT:
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if ((fd = server_start()) == -1)
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goto failed;
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break;
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default:
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goto failed;
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}
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}
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if ((mode = fcntl(fd, F_GETFL)) == -1)
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fatal("fcntl failed");
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if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
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fatal("fcntl failed");
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return (fd);
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failed:
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close(fd);
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return (-1);
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}
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/* Client main loop. */
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int
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client_main(int argc, char **argv, int flags)
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{
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struct cmd *cmd;
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struct cmd_list *cmdlist;
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struct msg_command_data cmddata;
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int cmdflags, fd;
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enum msgtype msg;
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char *cause;
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/* Set up the initial command. */
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cmdflags = 0;
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if (shell_cmd != NULL) {
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msg = MSG_SHELL;
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cmdflags = CMD_STARTSERVER;
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} else if (argc == 0) {
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msg = MSG_COMMAND;
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cmdflags = CMD_STARTSERVER|CMD_SENDENVIRON|CMD_CANTNEST;
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} else {
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msg = MSG_COMMAND;
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/*
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* It sucks parsing the command string twice (in client and
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* later in server) but it is necessary to get the start server
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* flag.
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*/
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if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
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log_warnx("%s", cause);
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return (1);
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}
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cmdflags &= ~CMD_STARTSERVER;
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TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
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if (cmd->entry->flags & CMD_STARTSERVER)
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cmdflags |= CMD_STARTSERVER;
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if (cmd->entry->flags & CMD_SENDENVIRON)
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cmdflags |= CMD_SENDENVIRON;
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if (cmd->entry->flags & CMD_CANTNEST)
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cmdflags |= CMD_CANTNEST;
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}
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cmd_list_free(cmdlist);
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}
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/*
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* Check if this could be a nested session, if the command can't nest:
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* if the socket path matches $TMUX, this is probably the same server.
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*/
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if (shell_cmd == NULL && environ_path != NULL &&
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cmdflags & CMD_CANTNEST && strcmp(socket_path, environ_path) == 0) {
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log_warnx("sessions should be nested with care. "
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"unset $TMUX to force.");
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return (1);
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}
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/* Initialise the client socket and start the server. */
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fd = client_connect(socket_path, cmdflags & CMD_STARTSERVER);
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if (fd == -1) {
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log_warn("failed to connect to server");
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return (1);
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}
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/* Set process title, log and signals now this is the client. */
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setproctitle("client (%s)", socket_path);
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logfile("client");
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/* Create imsg. */
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imsg_init(&client_ibuf, fd);
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event_set(&client_event, fd, EV_READ, client_callback, shell_cmd);
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/* Establish signal handlers. */
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set_signals(client_signal);
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/* Send initial environment. */
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if (cmdflags & CMD_SENDENVIRON)
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client_send_environ();
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client_send_identify(flags);
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/* Send first command. */
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if (msg == MSG_COMMAND) {
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/* Fill in command line arguments. */
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cmddata.pid = environ_pid;
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cmddata.idx = environ_idx;
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/* Prepare command for server. */
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cmddata.argc = argc;
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if (cmd_pack_argv(
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argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) {
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log_warnx("command too long");
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return (1);
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}
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client_write_server(msg, &cmddata, sizeof cmddata);
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} else if (msg == MSG_SHELL)
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client_write_server(msg, NULL, 0);
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/* Set the event and dispatch. */
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client_update_event();
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event_dispatch();
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/* Print the exit message, if any, and exit. */
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if (client_attached && client_exitmsg != NULL && !login_shell)
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printf("[%s]\n", client_exitmsg);
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return (client_exitval);
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}
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/* Send identify message to server with the file descriptors. */
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void
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client_send_identify(int flags)
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{
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struct msg_identify_data data;
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char *term;
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int fd;
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data.flags = flags;
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if (getcwd(data.cwd, sizeof data.cwd) == NULL)
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*data.cwd = '\0';
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term = getenv("TERM");
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if (term == NULL ||
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strlcpy(data.term, term, sizeof data.term) >= sizeof data.term)
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*data.term = '\0';
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if ((fd = dup(STDIN_FILENO)) == -1)
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fatal("dup failed");
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imsg_compose(&client_ibuf,
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MSG_IDENTIFY, PROTOCOL_VERSION, -1, fd, &data, sizeof data);
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if ((fd = dup(STDOUT_FILENO)) == -1)
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fatal("dup failed");
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imsg_compose(&client_ibuf,
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MSG_STDOUT, PROTOCOL_VERSION, -1, fd, NULL, 0);
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if ((fd = dup(STDERR_FILENO)) == -1)
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fatal("dup failed");
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imsg_compose(&client_ibuf,
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MSG_STDERR, PROTOCOL_VERSION, -1, fd, NULL, 0);
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}
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/* Forward entire environment to server. */
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void
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client_send_environ(void)
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{
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struct msg_environ_data data;
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char **var;
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for (var = environ; *var != NULL; var++) {
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if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
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continue;
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client_write_server(MSG_ENVIRON, &data, sizeof data);
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}
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}
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/* Write a message to the server without a file descriptor. */
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void
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client_write_server(enum msgtype type, void *buf, size_t len)
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{
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imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len);
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}
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/* Update client event based on whether it needs to read or read and write. */
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void
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client_update_event(void)
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{
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short events;
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event_del(&client_event);
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events = EV_READ;
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if (client_ibuf.w.queued > 0)
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events |= EV_WRITE;
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event_set(
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&client_event, client_ibuf.fd, events, client_callback, shell_cmd);
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event_add(&client_event, NULL);
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}
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/* Callback to handle signals in the client. */
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/* ARGSUSED */
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void
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client_signal(int sig, unused short events, unused void *data)
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{
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struct sigaction sigact;
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int status;
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if (!client_attached) {
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switch (sig) {
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case SIGCHLD:
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waitpid(WAIT_ANY, &status, WNOHANG);
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break;
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case SIGTERM:
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event_loopexit(NULL);
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break;
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}
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} else {
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switch (sig) {
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case SIGHUP:
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client_exitmsg = "lost tty";
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client_exitval = 1;
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client_write_server(MSG_EXITING, NULL, 0);
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break;
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case SIGTERM:
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client_exitmsg = "terminated";
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client_exitval = 1;
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client_write_server(MSG_EXITING, NULL, 0);
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break;
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case SIGWINCH:
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client_write_server(MSG_RESIZE, NULL, 0);
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break;
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case SIGCONT:
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memset(&sigact, 0, sizeof sigact);
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = SA_RESTART;
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sigact.sa_handler = SIG_IGN;
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if (sigaction(SIGTSTP, &sigact, NULL) != 0)
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fatal("sigaction failed");
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client_write_server(MSG_WAKEUP, NULL, 0);
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break;
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}
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}
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client_update_event();
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}
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/* Callback for client imsg read events. */
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/* ARGSUSED */
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void
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client_callback(unused int fd, short events, void *data)
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{
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ssize_t n;
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int retval;
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if (events & EV_READ) {
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if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
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goto lost_server;
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if (client_attached)
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retval = client_dispatch_attached();
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else
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retval = client_dispatch_wait(data);
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if (retval != 0) {
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event_loopexit(NULL);
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return;
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}
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}
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if (events & EV_WRITE) {
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if (msgbuf_write(&client_ibuf.w) < 0)
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goto lost_server;
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}
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client_update_event();
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return;
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lost_server:
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client_exitmsg = "lost server";
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client_exitval = 1;
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event_loopexit(NULL);
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}
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/* Dispatch imsgs when in wait state (before MSG_READY). */
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int
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client_dispatch_wait(void *data)
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{
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struct imsg imsg;
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ssize_t n, datalen;
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struct msg_shell_data shelldata;
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struct msg_exit_data exitdata;
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const char *shellcmd = data;
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if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
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fatalx("imsg_read failed");
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for (;;) {
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if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
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fatalx("imsg_get failed");
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if (n == 0)
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return (0);
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datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
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switch (imsg.hdr.type) {
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case MSG_EXIT:
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case MSG_SHUTDOWN:
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if (datalen != sizeof exitdata) {
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if (datalen != 0)
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fatalx("bad MSG_EXIT size");
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} else {
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memcpy(&exitdata, imsg.data, sizeof exitdata);
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client_exitval = exitdata.retcode;
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}
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imsg_free(&imsg);
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return (-1);
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case MSG_READY:
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if (datalen != 0)
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fatalx("bad MSG_READY size");
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client_attached = 1;
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break;
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case MSG_VERSION:
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if (datalen != 0)
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fatalx("bad MSG_VERSION size");
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log_warnx("protocol version mismatch (client %u, "
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"server %u)", PROTOCOL_VERSION, imsg.hdr.peerid);
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client_exitval = 1;
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imsg_free(&imsg);
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return (-1);
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case MSG_SHELL:
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if (datalen != sizeof shelldata)
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fatalx("bad MSG_SHELL size");
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memcpy(&shelldata, imsg.data, sizeof shelldata);
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shelldata.shell[(sizeof shelldata.shell) - 1] = '\0';
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clear_signals(0);
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shell_exec(shelldata.shell, shellcmd);
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/* NOTREACHED */
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default:
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fatalx("unexpected message");
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}
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imsg_free(&imsg);
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}
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}
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/* Dispatch imsgs in attached state (after MSG_READY). */
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/* ARGSUSED */
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int
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client_dispatch_attached(void)
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{
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struct imsg imsg;
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struct msg_lock_data lockdata;
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struct sigaction sigact;
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ssize_t n, datalen;
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for (;;) {
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if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
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fatalx("imsg_get failed");
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if (n == 0)
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return (0);
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datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
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log_debug("client got %d", imsg.hdr.type);
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switch (imsg.hdr.type) {
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case MSG_DETACH:
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if (datalen != 0)
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fatalx("bad MSG_DETACH size");
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client_write_server(MSG_EXITING, NULL, 0);
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client_exitmsg = "detached";
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break;
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case MSG_EXIT:
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if (datalen != 0 &&
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datalen != sizeof (struct msg_exit_data))
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fatalx("bad MSG_EXIT size");
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client_write_server(MSG_EXITING, NULL, 0);
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client_exitmsg = "exited";
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break;
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case MSG_EXITED:
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if (datalen != 0)
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fatalx("bad MSG_EXITED size");
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imsg_free(&imsg);
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return (-1);
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case MSG_SHUTDOWN:
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if (datalen != 0)
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fatalx("bad MSG_SHUTDOWN size");
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client_write_server(MSG_EXITING, NULL, 0);
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client_exitmsg = "server exited";
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client_exitval = 1;
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break;
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case MSG_SUSPEND:
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if (datalen != 0)
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fatalx("bad MSG_SUSPEND size");
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memset(&sigact, 0, sizeof sigact);
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = SA_RESTART;
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sigact.sa_handler = SIG_DFL;
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if (sigaction(SIGTSTP, &sigact, NULL) != 0)
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fatal("sigaction failed");
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kill(getpid(), SIGTSTP);
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break;
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case MSG_LOCK:
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if (datalen != sizeof lockdata)
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fatalx("bad MSG_LOCK size");
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memcpy(&lockdata, imsg.data, sizeof lockdata);
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lockdata.cmd[(sizeof lockdata.cmd) - 1] = '\0';
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system(lockdata.cmd);
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client_write_server(MSG_UNLOCK, NULL, 0);
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break;
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default:
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fatalx("unexpected message");
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}
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imsg_free(&imsg);
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}
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}
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